Machine for dressing millstones



, rEn sTATEs 'PATENT oEEioE.

H. B. GILL, OI" OGDEN, NEW YORK.

MACHINE FOR DRESSINGIVIILLSTONES.

Specification of Letters Patent No. 24,385, dated June 14, 1859.

To all lwhom 'it may concern:

Be it known that I, H. B. GILL, of Ogden, in the county of Monroe andState of New York, have invented a new and Improved Machine for DressingMillstones; and I do hereby declare that the following is a full andexact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, in which-Figure 1, is a side elevation. Fig. 2, is a plan view showing the methodof` adjusting the striking lever, the parts being broken off. Fig. 3, isa plan view of the head of the striking lever; and Fig. 4L, is a frontelevation of the same.

In the drawings, A, represents a frame, one end of which is providedwith the curved way B, which bears the carriage C, Fig. 1. To an axlehaving the journals CZ working in two standards e e (one of which isbroken away in Fig. 1,) the striking lever Gr is attached, the oppositeend of which carries the pick H. On the forward part of the frame theshaft I, carries the driving wheel K, which gears with a small pinion onthe end of shaft J, which carries the balance wheel L. This shaft isprovided with the cam and friction roller M, which, in revolving, raisesthe striking lever, through the medium of the segmental arm O, thedropping of which gives the blow of the pick up the stone. The arm, O,works in a. longitudinal slot in the lever, (the front side of which isbroken away to show it to better advantage) and is pivoted at h. Theopposite extremity is formed of the segment of a circle, and passesthrough the end of the slide plate N, on the top of which is a rack-bar,7c, in to which the toothed pinion, g, gears.

A hand wheel, Z, on the end of the shaft of g, enables this pinion to beturned, whereby the slide plate, N, is moved forward or backward,raising or lowering the arm O. As this arm forms the place of contactwith the cam, M, in actuating the lever, the raising or lowering of itdiminishes or increases the force of the blow, which is given in part bythe weight of the lever and pick in falling, and aided by the coiledspring P, which also serves to render the action steady and uniform.

The frame is supported on four feed rollers, r r, which rest on thesurface of the stone to be dressed. The journals are provided with smallpinions, s s, s s, which are operated by the screw thread of the shaftT, which derives its motion from the shaft I through the intermediateshaft Q, and beveled gearing. By this means the machine is moved slowlyforward to bring the pick to operate on new surface, and by using screwvshafts showing coarser or finer threads the movement of the machine inrelation to the strokes of the pick may be varied as required.

The position of the pick to the lever may be changed so as to cuttransversely or obliquely, by the small lever and ratchet, v w. Thedirect-ion of the series of cuts or the grooves or channels in the dressof mill stones may be accommodated in a very convenient manner bysliding the carriage C, on the circular way B, rendering the axis of thelever more or less oblique to the frame A, as in Fig. 2.

The pick is secured to the bearer by insert-ing the end in the groovewhere the pin y, enters a notch provided for the purpose, (as shown indotted lines Fig. 4,) while the crank 2, passes through a slot below andbeing turned, holds it securely in its place.

The facility with which the operator can vary the force and frequency ofthe blows, the ease and regularity with which it may be fed forward orback, and made to cut in different directions, render it an efficientand easily controlled machine for the purpose for which it is intended.

What I claim as my invention and desire to secure by Letters Patent is-The combination and arrangement of the pivoted segmental arm O, andslide N, with the, striking lever G, and cam M, or its equivalent,substantially in the manner and for the purpose set forth.

S. J. ALLIS.

